how to fix a misfire code P0301 in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather the necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, ratchet extension, spark plug socket.
• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Disconnect the electrical connector from the ignition coil on cylinder 1.
  3. Remove the ignition coil by unbolting it and gently pulling it from the spark plug well.
  4. Remove the spark plug using the spark plug socket and ratchet.
  5. Inspect the old spark plug for wear; if damaged, replace it with a new spark plug, ensuring it is gapped correctly (typically 0.028-0.032 inches).
  6. Install the new ignition coil onto the spark plug and secure it with the bolt.
  7. Reconnect the electrical connector to the ignition coil.

3. Check Fuel Injector

• Tools Required: Multimeter, fuel injector cleaner (if necessary).
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check the resistance of the fuel injector, ensuring it is within the manufacturer’s specifications.
  3. If the injector is faulty, replace it with a new one, reconnecting the electrical connector afterward.

4. Final Assembly

• Reinstall any components removed during the process, including the engine cover.
• Reconnect the negative battery terminal.
• Start the engine and allow it to idle to ensure all components are functioning correctly.